Control of Particle Damper Nonlinearity
Control of Particle Damper Nonlinearity
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DOI：
10.2514/1.38795
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发表时间：
2008-04
期刊：
影响因子：
2.5
通讯作者：
Chian Wong;J. Rongong
中科院分区：
文献类型：
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作者：
Chian Wong;J. Rongong
颗粒阻尼器包括封装在容器中的粒状材料，该容器附接到振动结构或在振动结构内。颗粒阻尼器通过摩擦、非弹性碰撞和动能储存的组合来抑制振动。主要的挑战是它们的性能是高度非线性的，并且取决于许多参数。虽然已经做出了重大的努力来表征和建模颗粒阻尼器，但很少有证据表明，已经做出了努力来有效地调节或控制其非线性行为。在这个项目中进行的研究工作是基于这样的假设，即阻尼器内的颗粒状态可以以可预测的方式改变，以确保在阻尼高的区域中运行。这项工作表明，这可以通过改变颗粒系统中的静态有效压力来实现。考虑了各种物理实施方案（包括磁场和气囊）：设计特点是简单，均匀的压力分布，易于自动化。最终选择的配置是一层厚的聚氨酯泡沫，可以根据螺旋盖的密封性，用各种压力将其压在颗粒上。还通过使用适当的相互作用模型运行阻尼器的离散元件建模预测来获得第二组能量损失估计。最后与物理实验结果进行了比较。
A particle damper comprises granular material enclosed in a container that is attached to or within a vibrating structure. Vibration is suppressed by the particle damper by a combination of friction, inelastic collisions, and kinetic energy storage. The principal challenges are that their performance is highly nonlinear and is dependent on many parameters. Although significant efforts have been made to characterize and model particle dampers, there is very little evidence of efforts made to tune or control their nonlinear behavior effectively. The research work carried out in this project is based on the supposition that the granular state within the damper can be altered in a predictable way to ensure that one operates in a zone where damping is high. This work shows that this can be achieved by altering the static effective pressure in the granular system. A variety of physical embodiments were considered (including magnetic fields and airbags): the design features sought were simplicity, uniform pressure distribution, and ease of automation. The final configuration selected was a thick layer of polyurethane foam that could be pressed down onto the particles with various pressures, depending on the tightness of the screw-top lid. A second set of energy loss estimates is also obtained by running the discrete element modeling prediction for the damper using appropriate interactions models. Results are finally compared with those obtained from physical experiments.